CVE-2026-100864
heym before 0.0.91 Remote Code Execution via Expression Engine
CVSS Score
8.8
EPSS Score
0.0%
EPSS Percentile
0th
heym before 0.0.91 contains a sandbox escape vulnerability in the expression engine's DotList map/filter and fallback resolver that allows authenticated users to execute arbitrary Python code. Attackers can craft workflow expressions using dunder attribute access through item expressions or the fallback resolver to access os.system and execute commands as the backend process.
| CWE | CWE-94 |
| Vendor | heymrun |
| Product | heym |
| Published | Sep 27, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
heymrun / heym
0 < 0.0.91
References
Credits
mbakgun